I feel like I remember a segment but I can't seem to find proof of it anywhere. I don't really remember much of it but from what I do:

Luffy and Co. slide past enemy lines and enter into this tower to challenge a floor that grants power over part of the sea (what exactly the floor gives I can't remember). But they end up running away from the navy and end up on one of the floors by accident and have to fight zombies from Thriller Bark because they have control over two of the floors. Does anyone remember this or am I losing it?